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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce466129271c1366d31be3d6ec10ea889f75c6ccd0fe52eef0ee23a67b675e15' 
  AND token = 'XInZI/nksz5Trs2BjCeYTBY8z6zR5RCqIFa+sCnoI5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}